Repeater



July 11, 1933. J. STICH 1,917,403

REPEATER Filed Dec. 7, 1931 Hit- Patented July 11, 1933 leans rice JOHANNES STICK, OF BERLIN-SIEMENSSTADT, GER-L /IANY, ASSIGNSR TO SIETv'iE-HS & HALSKE AKTIENGESELLSCHAFT, OF SIE1V1ENS$TADT NEAR BERLIN, GERIJIAIVY REPEATER Application filed December 7, 1931, Serial No. 579,3 7, and in Germany March 2, 1931.

The present invention relates to a circuit arrangement for transmission of impulses in telephone systems with automatic operation. In arrangements of this type it is known that the loop normally extends over the windings of a choke coil or the like on the outgoing side of the impulse repeater and that this choke coil is short-circuited during impulsing to improve the impulse transmission. This frequently gives rise to the occurrences that the impulse receiving relay, upon the completion of an impulse series, is influenced by induced impulses caused by the whole choke coil being connected up, thus bringing about faulty connections. The object of the present invention is to eliminate this drawback in a simple manner, this according to the invention being accomplished by the con trol devices which are required to set up the connection and which are influenced while an impulse series is being transmitted, being caused, after the impulse series has completed its operation, to connect up the windings of the choke coil stage by stage so as to bridge the outgoing leads.

An embodiment of the present invention is shown in the drawing.

lVhen the junction line VL is seized in some manner or other the bridging relay S, as usual, will be energized, causing relay V1 to respond over earth, battery, relay V1, contact 13, by opening contact 88 and closing contact 18. Relay Vl closes contact 2421 so that the following circuit is set up: earth, contact 2121, relay V2, relay V1, battery, earth. Due to the short-circuit at contact 18, relay V1 only is able to actuate its contacts. If the subscriber who has seized the junction line VL now sends out impulses, relay S will be deenergized in accordance with the interruptions of the impulse series. The impulses received by relay S are transmitted at contact 78 to relay A in known manner.

When relay S releases at the first interruption of the impulse series, the contact 18 will be opened and contact 88 closed. This removes the short-circuit for relay V2 with the result that it is energized. Relay V1, by reason of its slow action, is not deenergized due to the short-circuit of relay V1 at contact 88 since this contact is reopened before relay V1 is due to release, a fresh circuit being set up for relay V1 over contact 18. Relay V2 is not influenced even by its short circuit at contact 15* or by the further interruptions of the impulse series as it too operates as aslow-acting relay. The two relays V2 and V1, therefore, remain energized during the impulse series.

Contacts 4122 and 512 of relay V2 are ad usted so that on the operation of the relay contact 4112 is closed shortly after the armature starts its stroke whereas contact 5712 is not closed until the armature has nearly com pleted its stroke. Similarly, upon the release of the relay, contact 5 02 is opened shortly after the armature of the relay starts its return to normal while contact 402 is not closed until the armature has nearly reached.

its normal position.

The outgoing side of the junction line is disconnected from the condensers by relay V2 opening contacts 3e2 and 6'v2, and Wind ing I of the choke is short-circuited by the.v

closing of contact 4012, accomplished before contact 502 is closed. Said contact 5112 is closed shortly thereafter with the result that windings I and II of choke Dr are short-circuitedand a loop is formed over the speak. 'ing leads, lnsuring an impulse transmission satisfactory in every respect.

VVhen relay S remains permanently energized at the end of the lmpulse series, contact 18 also remains permanently closed, and,

consequently keeps relay V2 'short-circuited. Relay V2, therefore, releases at the end of the impulse series whereas relay V1 still remains energized over earth, battery, relay V1,

contact 18 and earth, even after the impulseseries has ended. When relay V2 is deener- I gized, contacts 402 and 502 will be opened in The induced impulses are suppressed to a minimum by this reconnecting up of the choke Dr stage by stage and in thismanner are prevented fromexereising an influence on the impulse receiving relay.

lVhat is claimed is:

1. In an impulse repeater, an incoming and an outgoing line, an impedance comprising a plurality of sections normally bridged across said outgoing line, means responsive to impulses received over said incoming line for repeating like impulses over said outgoing line, and means for short-circuiting said impedance during each impulse train and for successively reconnecting the sections of said impedance across said outgoing line, one aft-er the other, at the termination of the impulse train.

2. In an impulse repeater, an incoming and an outgoing line, an impedance comprisfor repeating like impulses over said outgoing line, and means for successively SllOlt-Clfcuiting the sections or" said impedance, one

after the other, at the beginning of an impulse train and for reconnecting said impedance across said outgoing line at the termination oil the impulse train.

3. In an impulse repeater, an incoming and an outgoing line, a repeating relay bridged across said incoming line, an impedance bridged across said outgoing line, said impedance being divided into a plurality of sections, a slow acting relay operated during each impulse series to short-circuit said impedance, and means controlled by said relay when it releases at the end of an impulse series for successively reconnecting the sections of said impedance across said outgoing line, one after the other.

In an impulse repeater, an incoming and an outgoing line coupled by condensers, a direct current bridge across said outgoing line comprising a plurality of impedances, means responsive to impulses received over said incoming line for repeating said impulses over said outgoin line, and means effective during each impulse series for disconnecting said outgoing line from said condensers and for short-circuiting said impedance bridge, said means being also eilective at the end of each impulse series to successively reconnect said impedances across said outgoing line, one after the other.

5. In an impulse repeater, an incoming and an outgoing line, a plurality of impedances normally bridges across said outgoing line, means responsive to impulses received over said incoming line for repeating said impulses over said outgoing line, a slow acting relay operated at the beginning of each impulse series to short-circuit said impedances for the duration of the series, and contacts on said relay for successively connecting said impedances across the outgoing line, one after the other, when said relay releases at the termination of the impulse series.

6. In an impulse repeater, an incoming line and an outgoing line coupled by condensers, a plurality of impedances bridged across said outgoing line, a repeating relay bridged across said incoming line and responsive to impulses to repeat the same over said outgoing line, a slow acting relay operated at the beginning of each impulse series and remaining operated throughout the series, and cont-acts on said slow acting relay to disconnecting said outgoing line from said condensers and short-circuiting said impedances when the relay is operated, and for reconnecting said outgoing line to said condensers and successively reconnecting said impedances across said outgoing line, one at a time, when the relay releases at the termination of the impulse series.

7. In an impulse repeater, an incoming line and an outgoing line, means responsive to impulses received over said incoming line for repeating like impulses over said outgoing line, a relay operated throughout each impulse series, and means controlled by said relay at the end of each impulse series for bridging impedances across said outgoing line and for subsequently increasing such impedance.

' In witness WhereoffI hereunto subscribe my name this 23rd day of October, A. D.

- J OHANNES STIGH. 

